Drawing-board



(No Model.)

0. E. SAJOUS.

DRAWING BOARD.

No. 429,203. Patented June 3,1890.

UNITE Y STATES PATENT OFFICE.

CHARLES E. SAJOUS, OF DEVON, ASSIGNOR TO SERENA M. BERGNER, OFPHILADELPHIA, PENNSYLVANIA.

DRAWING-BOARD.

SPECIFICATION forming part of Letters Patent No. 429,203, dated June 3,1890.

Application filed April 14, 1890.

To all whom it may concern:

Be it known that I, CHARLES E. SAJOUS, a citizen of the United States,residing at Devon, in the State of Pennsylvania, have invented certainnew and useful Improvements in Drawing-Boards, of which the following isa specification.

It is well understood by those skilled in the art to which my inventionrelates that drawing-boards and T-squares, as usually.

constructed and employed, are unreliable for drawing parallel lines,because the accuracy of the parallel motion of the T-squares isdependent upon the alignment of the edges of the drawing-boards and ofthe heads of the T-squares.

Heretofore various modifications in the construction and arrangement ofthe boards and of the rulers have been devised in order to make themmore reliable for ruling parallel lines. -For instance, a very efficientboard having an absolutely parallel motion has been provided byattaching the ruler to an endless cord stretched crosswise over groovedpulleys secured to the corners of aboard; but the expense of such typeof board to a greater or less extent has been a desideratum in theemployment of such boards.

The principal object of my present invention is to provide aninexpensive, durable, and efficient means for obviating theabovementioned defects and disadvantages and for insuring absoluteparallelism of motion of rulers used in connection with boards ofdifferent constructions for drawing purposes.

My invention consists of a drawing-board having recessed edges and aruler adjustably connected with a carriage or traveler provided withguide wheels or rollers engaging with or in the recessed portions of theboard, as is hereinafter more fully described, and pointed out in theclaims.

The nature and characteristic features of the invention will be morefully understood from the following description, taken in connectionwith the accompanying drawings, forming part hereof, and in which-Figure 1 is a top or plan View of a drawing-board provided with recessedor grooved ends or edges, and having also a slotted ruler Serial No.347,774. (No model.)

and mechanism adjustably connected therewith for actuating the same ofthe type embodying the features of my invention. Fig.

2 is a similar view, on an enlarged scale, of a portion of a boardshowing one of the grooved 5 5 or recessed ends or edges thereof and theguide Wheels or rollers engaging in said recesses or grooves, andshowing also the slotted ruler in connection with said boards. Fig. 3 isan end elevation of said board. Fig. l is a side elevational view of aboard, showing the ruler and the mechanism connected therewith andadapted v to actuate the same. Fig. 5 is a top or plan view of a drawingboard and ruler embodying a modified form of my invention, and Fig. 6 isan end view thereof.

Referring now to the drawings, and especially to Figs. 1, 2, 3, and 4, Ais a drawingboard of the usual or any preferred construction, having arecess or groove CL formed at or near the center of the edge thereof andextending entirely around the board.

B is a ruler having longitudinal slots Z) formed therein and extendinginward from 7 5 the respective extremital portions thereof, and throughwhich slots are adjustably attached means in engagement with carriagesor traw elers O, to be hereinafter fully described. Each of thesecarriages or travelers O is provided at or near the center thereof witha vertical set-screw c, and at the respective extremities of eachtraveler or carriage are journaled guide rollers or wheels 0 and 0 Thecarriages or travelers O are attached to 8 5 the extremital portions ofthe ruler B by means of the set-screws c, passing through the slots 1),and the guide rollers or wheels 0 and c are adapted to freely travel inthe grooves or recess a of the board A to cause 0 the ruler B to bemoved across the board to occupy a position parallel with its formerposition, thus insuring accuracy of work in drawing parallel lines.

It might be remarked that instead of adj usting the ruler so as tooccupy a position parallel with the edges of the board it may beadjusted at any required degree of inclination therewith by means of theset-screws c, as illustrated in dotted lines in Fig.1, with Ice outimpairing the parallelism of motion of the ruler B.

The construction and mode of operation of the modified form of theinvention illustrated in Figs. 5 and 6 are identical with theconstruetion and mode of operation of that above described andillustrated in Figs. 1, f2, 3, and :11, with the following exceptions:that the grooves or recesses b are formed adjacent to the upper surfaceof the board, so that the ruler B may be removed therefrom withoutunscrewing the set-screws c by simplylifting it off the board,and,moreover, the travelers or carriages O are curved upward at or neartheir centers, so as to properlysupport the ruler 13 adjacent orcontiguous to the surface of the board A.

Having thus described the nature and objeets of my invention, what Iclaim as new, and desire to secure by Letters Patent, is

1. The combination of a drawing-board having recessed edges or ends, aruler, carriages or travelers connected with said ruler, and guiderollers or wheels attached to said carriages or travelers and adapted totravel in said recessed edges or ends, substantially as and for thepurposes set forth.

2. The combination of a drawing-board having grooved edges, a ruler, andcarriages or travelers adjustably connected with the respectiveextremities of said ruler and provided with guide rollers or wheelsadapted to travel in said grooved edges, substantially as and for thepurposes set forth.

3. The combination of a drawing-board having recessed edges, a rulerhaving longitudinal slots formed therein, and carriages provided withguide-wheels adjustably connected with said ruler by means of set-screwsengaging in the slots thereof, substantially as and for the purposes setforth.

l. The combination of a drawing-board having its edges recessed adjacentto the surface thereof, a ruler, carriages or travelers adjustablyconnected with said ruler, and guide rollers or wheels attached to saidearriages or travelers and adapted to travel in and through the recessesof said board, sub stantially as and for the purposes set forth.

5. The combination of a drawing -board provided with recessed edges orends, travelers provided with guide-rollers journaled to the extremitiesthereof, a ruler, and means connected with said travelers for readilyadjusting said ruler thereto, substantially as and for the purposes setforth.

In witness whereof I have hereunto set my signature in the presence oftwo subscribing witnesses.

CHARLES E. SAJOUS.

Vitnesses:

Gno. W. REED, THOMAS M. SMITH.

